SPENCE FXT250 Steam Trap is a float and thermostatic steam trap designed for use in various industrial and commercial applications. Its unique design and construction provide several key capabilities and benefits:
-
Automatic condensate discharge: The FXT250 utilizes a float and thermostatic air vent to automatically discharge condensate from a system, ensuring efficient steam utilization and preventing waterlogging.
-
Continuous operation: The FXT250 operates continuously, responding to changes in load demand by modulating the flow of condensate. This ensures a consistent and reliable flow of steam to equipment.
SPENCE FXT250 Steam Trap is a float and thermostatic steam trap designed for use in various industrial and commercial applications. Its unique design and construction provide several key capabilities and benefits:
-
Automatic condensate discharge: The FXT250 utilizes a float and thermostatic air vent to automatically discharge condensate from a system, ensuring efficient steam utilization and preventing waterlogging.
-
Continuous operation: The FXT250 operates continuously, responding to changes in load demand by modulating the flow of condensate. This ensures a consistent and reliable flow of steam to equipment.
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Spence FXT250 Series Steam Trap
Instruction Manual
VCIMD-14913
November 2021
Figure 1. FXT250 Series Steam Trap
▲ WARNING
Failure to follow these instructions or
to properly install and maintain this
equipment could result in an explosion,
fire and/or chemical contamination
causing property damage and personal
injury or death.
FXT250 Series steam trap must be
installed, operated and maintained
in accordance with federal, state and
local codes, rules and regulations and
Emerson instructions.
If leak develops in the system, service
to the unit may be required. Failure
to correct trouble could result in a
hazardous condition.
Installation, operation and maintenance
procedures performed by unqualified
personnel may result in improper
adjustment and unsafe operation. Either
condition may result in equipment
damage or personal injury. Only a
qualified person shall install or service
the FXT250 Series steam trap.
Introduction
Scope of the Manual
This manual provides instructions for installation,
maintenance and parts information for the
FXT250 Series.
Product Description
FXT250 Series are float and thermostatic steam
traps. Float is free of levers, linkages or other
mechanical connections. This float is weighted to
maintain orientation and acts as the valve being free to
modulate condensate through the seat ring. Air vent is
balanced-pressure design with stainless steel welded
encapsulated bellows capable of discharging air and
non-condensable gases continuously within 15°F /
-9.4°C of saturated temperature.
Principle of Operation
On startup, the thermostatic air vent, caged stainless
welded bellows, is open, allowing air to flow freely
through the vent valve orifice. When condensate flows
into the trap, the float rises, allowing condensate
to be discharged. Once air and non-condensables
have been evacuated, hot condensate will cause the
thermostatic vent to close. Condensate will continue to
be discharged as long as condensation occurs. During
normal operation, an increase in the load causes
the liquid level in the trap to rise. The float then rises
and rolls off the seat ring, allowing more condensate
to flow out. The float sinks as the condensate load
decreases, moving nearer to the seat ring, decreasing
the effective size of the orifice and allowing less
condensate to discharge. This provides smooth,
continuous operation that reacts instantly to load
variation while maintaining a water seal over the seat
ring to prevent live steam loss.
FXT250 Series
Specifications
The specifications section on this page provide the ratings and other specifications for the FXT250 Series.
Available Configurations
Type FXT250: Low capacity
Type FXT251: Medium capacity
Type FXT252: High capacity
Type FXT253: Super high capacity
Body Sizes and End Connection Style
Maximum Operating Pressure(1)
See Table 1
Maximum Allowable Temperature(1)
450°F / 232°C
Materials of Construction
Body and Cover: Cast Iron ASTM A126B
Cover Gasket: Graphite Fiber
All Internal Parts: Stainless Steel
Air Vent: Stainless Steel
Options
SLR Orifice
Blowdown Valve
Orifice Continuous Bleed Air Vent
1. The pressure/temperature limits in this Instruction Manual and any applicable standard or code limitation should not be exceeded.
Table 1. Maximum Operating Pressure
ORIFICE
MAXIMUM OPERATING PRESSURE
psig barg
20 20 1.4
50 50 3.5
100 100 6.9
150 150 10.3
250 250 17.2
Installation
Install the FXT250 Series steam trap upright and in a
horizontal line with the arrow on the body pointing in
the direction of flow. Allowable inclination is 5° or less
horizontally and 5° or less at right angles to the plane
of the pipe line.
Maintenance
Due to normal wear that may occur, inspect the
parts periodically and replace if necessary. The
frequency of inspection depends on the severity of
service conditions.
△ CAUTION
Inspection of the thermostatic bellows
is not recommended as disassembly
generally damages the unit.
1. Disassemble the steam trap.
2. Remove the body bolts and place the lower body
on a safe place.
3. Inspect the float and lower seat ring for damage
and clean or replace as necessary. Clean the float
with a rag and steel wool.
4. Clean the screen using a wire brush.
5. Replace bellows if needed. Use needle nose
pliers or similar tool. Insert them into two of the
Maximum Allowable Pressure(1)
250 psig / 17.2 barg
BODY SIZE END CONNECTION
1/2, 3/4, 1, 1-1/2 and 2 in. / 12.7,
19.1, 25.4, 38.1 and 50.8 mm NPT
NPS 1-1/2 and 2 / DN 40 and 50 CL250 RF Flanged
2
FXT250 Series
three holes located in the bellows assembly and
unscrew it from the upper body.
Note
When reassembling, use threadlocker on
the bellows assembly threads.
6. After inspection or repair, reassemble trap by
replacing body gasket and torquing bolts as
specified, see Table 2.
Parts Ordering
When corresponding with your local Sales Office about
FXT250 Series Steam Trap, always reference the
assembly number. When ordering replacement parts
specify the complete character part number from the
following parts list.
Parts List
Key Description Part Number
Spare Parts Kit See Table 3
1 Gasket, Air Vent, Copper WAL05-14599-00
2 Upper Body, Cast Iron
NPS 3/4 / DN 20 WAL04-14604-00
NPS 1 / DN 25 WAL04-14606-00
3 Screen, 304 Stainless steel WAL05-14609-00
4 Float, 17-7 Stainless steel WAL05-16149-00
5 Gasket, Body, Graphite WAL05-13403-00
6 Lower Body, Cast Iron WAL04-14605-00
7 Bolt, Body, Steel (4 required) WAL05-14649-00
8 Pipe Plug, 1/4 NPT, Steel (2 required) WAL04-03772-00
9 Seat Ring, 416 Stainless steel
20 psi / 1.4 bar WAL04-14613-00
50 psi / 3.5 bar WAL04-15694-00
100 psi / 6.9 bar WAL04-14612-00
150 psi /10.3 bar WAL04-15690-00
250 psi / 17.2 bar WAL04-14611-00
10 Gasket, Seat Ring, Copper WAL05-14614-00
11 Sleeve, 316 Stainless steel WAL05-14610-00
12 Air Vent, Stainless steel WAL05-14603-00
Table 2. FXT250 Series Steam Trap Torque Values
TRAP TYPE BODY BOLTS SEAT RING SEAT RING
Ft-lb N•m Ft-lb N•m In.-lb N•m
FXT250 25 to 30 33.9 to 40.7 - - - - - - - - 78 to 84 8.81 to 9.49
FXT251 60 to 70 81.4 to 94.9 - - - - - - - - 132 to 134 14.9 to 15.1
FXT252 60 to 70 81.4 to 94.9 21.5 to 23.5 29.2 to 31.9 - - - - - - - -
FXT253 115 to 135 156 to 183 37 to 41 50.2 to 55.6 - - - - - - - -
Figure 2. FXT250 Series Steam Trap Operational Schematic
SEAT RING
ORIFICE
FLOAT
AIR VENT
12
11
10
9
1
2
3
4
5
6
7
8
Figure 3. FXT250 Series Steam Trap 1/2 to 2 NPT Assembly
3
FXT250 Series
Table 3. FXT250 Series Spare Parts Kit
NFT TRAP MODEL REPAIR KIT(1)(2) PCA SEAT KIT(3) AIR VENT KIT(4)(5) GASKET KIT(6)
FXT250-20 WAL5590110
WAL5590111 WAL33379
WAL5590012
FXT250-50 WAL5590210 WAL5590211
FXT250-100 WAL5590410 WAL5590411
FXT250-150 WAL5590510 WAL5590511
FXT250-250 WAL5590710 WAL5590711
FXT251-20 WAL5590130
WAL5590131 WAL33385
WAL5590032
FXT251-50 WAL5590230 WAL5590231
FXT251-100 WAL5590430 WAL5590431
FXT251-150 WAL5590530 WAL5590531
FXT251-250 WAL5590730 WAL5590731
FXT252-20 WAL5590150
WAL5590151 WAL33390
WAL5590052
FXT252-50 WAL5590250 WAL5590251
FXT252-100 WAL5590450 WAL5590451
FXT252-150 WAL5590550 WAL5590551
FXT252-250 WAL5590750 WAL5590751
FXT253-20 WAL5590170
WAL5590171 WAL33395
WAL5590072
FXT253-50 WAL5590270 WAL5590271
FXT253-100 WAL5590470 WAL5590471
FXT253-150 WAL5590570 WAL5590571
FXT253-250 WAL5590770 WAL5590771
1. Includes body gasket/s, air vent, air vent gasket, seat, seat gasket, screen, screen cap, float, tag and IOM.
2. For repair kit option, add "-SLR" to the end of the part number for the Steam Lock Release option.
3. Includes body gasket/s, seat, seat gasket, tag and IOM.
4. Includes body gasket/s, air vent, air vent gasket, tag and IOM.
5. Air vent tool part number is 04-15832-01.
6. Includes one body gasket. Some kits may include two gaskets as a kit for one FXT trap.
FXT250 Series
0011387
Emerson Automation Solutions
SpenceValve.com
Americas
McKinney, Texas 75070 USA
T +1 800 558 5853
+1 972 548 3574
Europe
Bologna 40013, Italy
T +39 051 419 0611
Asia Pacic
Singapore 128461, Singapore
T +65 6777 8211
Middle East and Africa
Dubai, United Arab Emirates
T +971 4 811 8100
VCIMD-14913 © 2021 Emerson Electric Co. All rights reserved. 11/21
Spence is a mark owned by one of the companies in the Emerson Automation
Solutions business unit of Emerson Electric Co. The Emerson logo is a
trademark and service mark of Emerson Electric Co. All other marks are
property of their prospective owners.
The contents of this publication are presented for informational purposes only,
and while every eort has been made to ensure their accuracy, they are not to
be construed as warranties or guarantees, express or implied, regarding the
products or services described herein or their use or applicability. All sales are
governed by our terms and conditions, which are available upon request. We
reserve the right to modify or improve the designs or specications of such
products at any time without notice.
Emerson Electric Co. does not assume responsibility for the selection, use
or maintenance of any product. Responsibility for proper selection, use
and maintenance of any Emerson Electric Co. product remains solely with
the purchaser.
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SPENCE FXT250 Steam Trap is a float and thermostatic steam trap designed for use in various industrial and commercial applications. Its unique design and construction provide several key capabilities and benefits:
-
Automatic condensate discharge: The FXT250 utilizes a float and thermostatic air vent to automatically discharge condensate from a system, ensuring efficient steam utilization and preventing waterlogging.
-
Continuous operation: The FXT250 operates continuously, responding to changes in load demand by modulating the flow of condensate. This ensures a consistent and reliable flow of steam to equipment.
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